Test tube film sealing device for tea pesticide residue detection

Abstract

A test tube film sealing device for tea pesticide residue detection comprises a guiding mechanism, a film heat sealing mechanism and a bearing mechanism, a downward-pressing driving assembly of the film heat sealing mechanism is in driving connection with a downward-pressing die, the guiding mechanism conveys a film belt to the position below the downward-pressing die, and a hot-pressing piece is arranged on the downward-pressing die; the downward pressing driving assembly is used for driving the downward pressing die to move in the direction close to or away from the film belt; the bearing mechanism comprises a bearing disc, a limiting block, a limiting plate and a bearing driving assembly, a containing hole is formed in the bearing disc, the containing hole and the limiting block are oppositely arranged, and the bearing driving assembly drives the bearing disc to be movably aligned with the lower pressing die; a buffering hole is formed in the limiting plate, a limiting rod is arranged on the face, away from the containing hole, of the limiting block, the limiting rod is sleeved with a spring, one end of the limiting rod penetrates through the buffering hole, the bearing driving assembly drives the limiting plate to move in the direction close to or away from the containing hole, and the buffering effect can be achieved; damage caused by excessive abutting of the bottoms of the test tubes and the limiting blocks is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of test tube film sealing equipment, in particular to a test tube film sealing device for detecting pesticide residues in tea. Background Art

[0002] Tea, commonly known as tea, originated in China and generally includes the leaves and buds of the tea tree. It contains catechins, cholestenone, caffeine, inositol, folic acid, pantothenic acid and other ingredients that are beneficial to health. It has many functions such as refreshing the brain, promoting diuresis and reducing swelling, preventing heatstroke and cooling down, protecting the cardiovascular system and improving gastrointestinal function, which can enhance human health. Tea beverages made from tea are one of the three major beverages in the world.

[0003] Tea trees may face attacks from various pests and diseases during the planting process. In order to protect the yield and quality of tea trees and tea leaves, pesticides are usually used for prevention and control. However, the use of pesticides must be strictly controlled to ensure that the pesticide residues in tea leaves are within the permitted range of standards.

[0004] Pesticide residues refer to the parent pesticide, its hazardous derivatives, metabolites, degradation products, and impurities that remain in the environment, organisms, and food after pesticide use. Excessive pesticide residues in tea are primarily caused by the use of organophosphorus and carbamate pesticides, such as methamidophos, omethoate, phorate, parathion, and methyl parathion, during tea cultivation. Drinking tea containing large amounts of highly toxic or extremely toxic pesticide residues can cause acute poisoning. While long-term consumption of tea with excessive pesticide residues will not cause acute poisoning, it can lead to chronic poisoning, illness, cancer, and even affect future generations.

[0005] When testing the pesticide residue components in tea, the collected samples need to be placed in test tubes, and then the corresponding reagents need to be added for sample preparation. However, in the automated preparation process of pesticide residue samples, the test tubes with samples and reagents added need to be sealed with film. However, after the robot clamps the test tube and places it into the placement hole on the support plate of the sealing machine and abuts against the limit block on the support plate, the robot still has a tendency to drive the test tube downward, causing the bottom of the test tube to over-abut against the limit block, which can easily cause the test tube to break. Utility Model Content

[0006] Based on this, it is necessary to provide a test tube sealing device for detecting pesticide residues in tea.

[0007] The utility model solves the above technical problems with the following technical solutions: A test tube film sealing device for tea pesticide residue detection comprises: a guiding mechanism, a heat sealing mechanism and a supporting mechanism;

[0008] The heat-sealing film mechanism includes a lower die and a lower-pressing drive assembly, wherein the lower-pressing drive assembly is connected to the lower die in a driving manner, the guide mechanism is used to convey the film strip to the bottom of the lower die, the lower die is provided with a hot pressing piece, and the lower-pressing drive assembly drives the lower die to move toward or away from the film strip;

[0009] The supporting mechanism includes: a supporting tray, a limiting block, a limiting plate and a supporting drive assembly, wherein a placement hole is opened on the supporting tray, and the placement hole is arranged opposite to the limiting block, and the supporting drive assembly drives the supporting tray to align with the lower die;

[0010] A buffer hole is provided on the limit plate, a limit rod is provided on the side of the limit block away from the placement hole, a spring is sleeved on the limit rod, and one end of the limit rod passes through the buffer hole, and the supporting drive assembly drives the limit plate to move toward or away from the placement hole.

[0011] In one embodiment, the supporting drive assembly includes: a driving rod, a second motor and two fixed seats, the two fixed seats are arranged opposite to each other, and the relative inner sides of the two fixed seats are provided with a first sliding groove extending outward and lifting, the second motor drives the driving rod to roll in the first sliding groove, and the first connecting rod is provided on the side of the supporting tray facing the limit block, the second motor is slidably set on the first connecting rod, and the limit plate is connected to the second motor.

[0012] In one embodiment, second sliding grooves are provided on opposite inner side surfaces of the two fixing seats, each of the second sliding grooves is arranged opposite to one of the first sliding grooves, and the supporting tray is slidably arranged between the two second sliding grooves.

[0013] In one embodiment, the guiding mechanism includes: a first motor, a feed roller and a receiving roller, the feed roller and the receiving roller are arranged opposite to each other, the axial direction of the feed roller and the axial direction of the receiving roller are parallel to each other, the first motor is driven and connected to the receiving roller, and the feed roller and the receiving roller are used for winding film tape.

[0014] In one embodiment, the guide mechanism further includes: a first guide post and a second guide post, wherein the first guide post and the second guide post are relatively arranged on two sides of the lower die.

[0015] In one embodiment, a sleeve is provided in the placement hole, and the sleeve at least partially protrudes from a side of the supporting tray facing the limiting block.

[0016] In one embodiment, two second connecting rods are provided on a surface of the supporting tray facing the limit block, and the two second connecting rods are arranged opposite to each other. A buffer plate is provided on the limit rod, and a limit hole is provided at both ends of the buffer plate. Each second connecting rod passes through one of the limit holes, and the limit rod is connected to the limit block through the buffer plate.

[0017] In one embodiment, a plurality of punching tools are provided on the lower die, and each of the punching tools is arranged around the hot pressing part.

[0018] In one embodiment, the hot pressing piece is in the shape of a ring.

[0019] The beneficial effects of the utility model are as follows: the utility model provides a test tube film sealing device for tea pesticide residue detection, when used for test tube film sealing, the robot clamps the test tube, passes through the placement hole and places it on the limit block, because the limit block is provided with a limit rod on the side away from the placement hole, the limit rod is sleeved with a spring, and a buffer hole is provided on the limit plate, through which one end of the limit rod passes through the buffer hole, and the spring is located between the limit block and the limit plate, which can play a buffering role to avoid damage caused by excessive abutment between the bottom of the test tube and the limit block, and then the support drive assembly drives the support tray to align with the lower die, and the guiding mechanism conveys the film strip to the bottom of the lower die, the lower die punches downward, and the hot pressing part abuts the test tube and the film strip to complete the heat sealing of the test tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of one direction of a test tube sealing device for detecting pesticide residues in tea according to one embodiment;

[0021] Figure 2 The figure is a schematic structural diagram of another direction of a test tube sealing device for detecting pesticide residues in tea according to one embodiment.

[0022] In the accompanying drawings, 600 is a test tube sealing device for detecting pesticide residues in tea leaves; 610 is a machine body; 611 is a feed roller; 612 is a receiving roller; 613 is a first guide column; 614 is a second guide column; 615 is an auxiliary guide column; 621 is a lower pressing die; 631 is a supporting tray; 632 is a placement hole; 633 is a limiting rod; 634 is a spring; 635 is a limiting plate; 636 is a limiting block; 641 is a fixing seat; 642 is a first slide groove; 643 is a first connecting rod; 644 is a driving rod; 645 is a second motor; 646 is a second slide groove; 651 is a second connecting rod; 652 is a buffer plate; 660 is a test tube. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The following will further describe the technical solution of the present invention in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0024] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc. indicating an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] like Figure 1 and Figure 2 As shown, a test tube film sealing device 600 for detecting pesticide residues in tea leaves comprises: a guiding mechanism, a heat-sealing film mechanism and a supporting mechanism; the heat-sealing film mechanism comprises a lower pressing die 621 and a lower pressing drive assembly, the lower pressing drive assembly is connected to the lower pressing die 621, the guiding mechanism is used to convey the film strip to the bottom of the lower pressing die 621, the lower pressing die 621 is provided with a hot pressing piece, and the lower pressing drive assembly drives the lower pressing die 621 to move toward or away from the film strip; the supporting mechanism comprises: a supporting tray 631, a limiting block 636, a limiting plate 635 and a supporting drive assembly. Component, a placement hole 632 is provided on the supporting tray 631, and the placement hole 632 is arranged opposite to the limit block 636. The supporting drive component drives the supporting tray 631 to be aligned with the lower pressing die 621; a buffer hole is provided on the limit plate 635, and a limit rod 633 is provided on the side of the limit block 636 away from the placement hole 632. A spring 634 is provided on the limit rod 633, and one end of the limit rod 633 passes through the buffer hole. The supporting drive component drives the limit plate 635 to move toward or away from the placement hole 632.

[0026] In this embodiment, the guide mechanism, the heat-sealing film mechanism and the supporting mechanism are sequentially arranged on the machine body 610 along the vertical direction. When heat-sealing the tube mouth of the test tube 660, the supporting driving assembly first drives the supporting tray 631 to be offset from the lower pressing die 621. At this time, the supporting driving assembly drives the limiting plate 635 to approach the placement hole 632, so that the limiting block 636 approaches the placement hole 632. In this way, the test tube 660 is clamped by the manipulator through the placement hole 632 and placed on the limiting block 636, and the test tube 660 partially protrudes from the placement hole 632. When the manipulator clamps the test tube 660 and places it on the limiting block 636 so that the bottom of the test tube 660 abuts against the limiting block 636, the limiting block 636 is pressed downward, and the spring 634 is compressed and elastically deformed, which can buffer the impact force when the test tube 660 is placed, prevent the bottom of the test tube 660 from excessively abutting against the limiting block 636, and play a role in protecting the test tube 660 and preventing the test tube 660 from being damaged. Then, the supporting drive assembly first drives the supporting tray 631 to align with the lower pressing die 621, and the supporting drive assembly drives the limiting plate 635 away from the placement hole 632 until the tube mouth of the test tube 660 is aligned with the hole mouth of the placement hole 632, and the side wall of the tube mouth of the test tube 660 abuts against the side wall of the placement hole 632, and the test tube 660 can be fixed in the placement hole 632. Since the placement hole 632 on the supporting tray 631 is relatively arranged with the hot pressing piece on the lower pressing die 621, and the shape of the hot pressing piece is annular, the guiding mechanism transports the film strip to the lower The film strip between the die 621 and the supporting tray 631 is a heat-sealing film, which is used to seal the tube mouth of the test tube 660. In the initial state, the sealing film is in a strip shape. The downward pressure driving component drives the lower die 621 to press down, and seals the heat-sealing film on the tube mouth of the test tube 660. Finally, the supporting driving component drives the supporting tray 631 to be staggered with the lower die 621. At this time, the supporting driving component drives the limiting plate 635 to approach the placement hole 632, so that the test tube 660 partially protrudes from the placement hole 632, which is convenient for the robot to clamp the test tube 660 for the next process.

[0027] like Figure 1As shown, in order to realize the conveying of the film strip to the bottom of the lower die 621, in one embodiment, the guiding mechanism includes: a first motor, a feed roller 611 and a take-up roller 612, the feed roller 611 and the take-up roller 612 are arranged opposite to each other, the axial direction of the feed roller 611 and the axial direction of the take-up roller 612 are parallel to each other, the first motor is driven and connected to the take-up roller 612, and the feed roller 611 and the take-up roller 612 are used to wind the film strip. Specifically, the film strip is wound on the feed roller 611, and one end of the film strip on the feed roller 611 is wound on the take-up roller 612. The take-up roller 612 rotates synchronously with the feed roller 611 and rotates in the same direction, so that the film strip on the feed roller 611 is continuously conveyed toward the take-up roller 612, and the take-up roller 612 winds and collects the film strip, thereby realizing the conveyance of the film strip from the feed roller 611 to the take-up roller 612. In other embodiments, the first motor is further connected to the feed roller 611 through a transmission rod and a gear set. In this way, the first motor simultaneously drives the feed roller 611 and the take-up roller 612 to rotate, and the feed roller 611 and the take-up roller 612 rotate synchronously. For example, the feed roller 611 and the take-up roller 612 rotate clockwise, thereby allowing the film strip on the feed roller 611 to be transferred to the take-up roller 612 and sequentially wound around the take-up roller 612. During the film strip conveying process, the lower die 621 is located above the film strip, and the receiving tray 631 is located below the film strip.

[0028] In this embodiment, a tray 631 is used to support a test tube 660. The test tube 660 supported by the tray 631 is located below the conveying film strip. The tray 631 includes a tray body and a protruding fixing rib provided on the outer edge of the tray body. The fixing rib is circular in shape. Thus, when the cylindrical test tube 660 is placed on the tray 631, the outer edge of the test tube 660 abuts the fixing rib. The fixing rib ensures that the test tube 660 is securely placed within the tray 631. The support drive assembly drives the tray 631 between the feed roller 611 and the receiving roller 612 and below the lower die 621. The lower die 621 is driven by the lower drive assembly to move vertically downward or upward. Specifically, the lower die 621 is driven by the lower drive assembly to move toward the test tube 660 on the tray 631, causing the hot press to move toward the test tube 660 to complete the heat sealing.

[0029] In one embodiment, in order to drive the lower pressing die 621 to move, the lower pressing drive assembly includes a lower pressing drive motor, a lower pressing screw and a lower pressing guide rail. The lower pressing die is provided with a sliding hole, and the lower pressing guide rail is passed through the sliding hole. The lower pressing die 621 is slidably set on the lower pressing guide rail through the sliding hole. The lower pressing drive motor is connected to the lower pressing screw drive. The lower pressing die 621 is provided with a screw hole, and the lower pressing screw is passed through the screw hole and is screwed to the side wall of the screw hole. In this way, the lower pressing drive motor drives the lower pressing die 621 to move through the lower pressing screw, so that the lower pressing die 621 can move in the vertical direction along the lower pressing guide rail, thereby realizing the driving of the lower pressing die 621, so that the lower pressing die 621 can drive the downward pressing movement of the hot pressing part, and then can heat seal the edge of the tube mouth of the test tube 660.

[0030] Furthermore, a sleeve is provided in the placement hole 632, and the sleeve at least partially protrudes from the side of the supporting tray 631 facing the limit block 636. In this way, the test tube 660 can be well confined between the supporting tray 631 and the limit block 636 in cooperation with the limit block 636. Furthermore, a groove is provided on the limit block 636 for fixing the bottom of the test tube 660.

[0031] like Figure 1 and Figure 2 As shown, in order to fully unfold the film strip, in one embodiment, the guide mechanism further includes: a first guide post 613 and a second guide post 614, which are relatively arranged on both sides of the lower die 621. Specifically, the first guide post 613 and the second guide post 614 are distributed on both sides of the lower die 621 and are arranged at the same height. The film strip is sequentially transported from the feed roller 611 to the first guide post 613, the bottom of the lower die 621, and the second guide post 614, and finally recovered to the receiving roller 612, so that the film strip located on the first guide post 613 and the second guide post 614 can be better unfolded, which facilitates downward pressure to seal the film. Furthermore, the first guide post 613 and the second guide post 614 are rotatable. In another embodiment, the feed roller 611 and the receiving roller 612 are located above the lower die 621, and cooperate with the first guide column 613 and the second guide column 614 to transport the film tape to the top of the lower die 621. Furthermore, two auxiliary guide columns 615 are arranged between the first guide column 613 and the second guide column 614, so that the film tape below the lower die 621 can be fully unfolded.

[0032] In order to realize the support drive assembly driving the support tray 631 to align with the lower die 621, and drive the limit plate 635 to move toward or away from the placement hole 632. In one embodiment, the support drive assembly includes: a drive rod 644, a second motor 645 and two fixed seats 641, the two fixed seats 641 are arranged opposite to each other, and the relative inner side surfaces of the two fixed seats 641 are provided with a first sliding groove 642 extending outward and lifting, the second motor 645 drives the drive rod 644 to roll in the first sliding groove 642, the support tray 631 is provided with a first connecting rod 643 on the side facing the limit block 636, the second motor 645 is slidably arranged on the first connecting rod 643, and the limit plate 635 is connected to the second motor 645. Specifically, rollers are provided at both ends of the driving rod 644, and the rollers roll on the first slide groove 642. A shell is provided in the middle of the driving rod 644, and the second motor 645 is provided in the shell. When the second motor 645 drives the driving rod 644 to roll on the first slide groove 642, a through hole is provided on the shell loaded with the second motor 645, and the first connecting rod 643 is passed through the through hole. The shell is slidably provided on the first connecting rod 643 through the through hole, so as to cooperate with the first connecting rod 643 to drive the supporting tray 631 to move horizontally. Since the first slide groove 642 is a curved groove, it is a smooth transition S-shaped slide groove. That is, the first slide groove 642 includes: a first straight groove, a curved groove and a second straight groove, the first straight groove, the curved groove and the second straight groove are connected in sequence, one end of the curved groove is connected to the first straight groove, and the other end of the curved groove gradually tilts downward and is connected to the second straight groove, so that the roller can roll down from the first straight groove to the second straight groove through the curved groove, so that the shell can move vertically downward or vertically upward along the first connecting rod 643, and then drive the limit plate 635 to move toward or away from the placement hole 632, driving the limit block 636 set on the limit plate 635 to move in the vertical direction.

[0033] like Figure 2 As shown, in order to enable the support tray 631 to move more smoothly, in one embodiment, second slide grooves 646 are provided on the opposing inner side surfaces of the two fixing seats 641. Each second slide groove 646 is arranged opposite to a first slide groove 642, and the support tray 631 is slidably arranged between the two second slide grooves 646. Specifically, the second slide grooves 646 are linear slide grooves, and the second slide grooves 646 are located above the first slide grooves 642. Both sides of the support tray 631 are slidably arranged in a second slide groove 646. In this way, the second slide grooves 646 can not only limit the movement direction of the support tray 631, but also support the support tray 631. At the same time, the first slide grooves 642 support the support tray 631, and the driving rod 644 can also better roll on the first slide grooves 642.

[0034] like Figure 2 As shown, in order to enable the limiting plate 635 to move more smoothly, in one embodiment, two second connecting rods 651 are provided on the side of the support tray 631 facing the limiting block 636. The two second connecting rods 651 are arranged opposite each other, and a buffer plate 652 is provided on the limiting rod 633. Both ends of the buffer plate 652 have a limiting hole, and each second connecting rod 651 passes through one of the limiting holes. The limiting rod 633 is connected to the limiting block 636 through the buffer plate 652. Specifically, the two second connecting rods 651 are arranged opposite each other on both sides of the placement hole 632, and both ends of the buffer plate 652 have a limiting hole. The buffer plate 652 is slidably arranged between the two second connecting rods 651 through the limiting holes. One side of the buffer plate 652 is connected to the limiting block 636, and the opposite side of the buffer plate 652 is connected to the limiting rod 633. In this way, the support drive assembly drives the limiting block 636 to move more smoothly in the vertical direction.

[0035] In order to ensure that the heat-sealing film can be cut off and separated from the film strip after being hot-pressed on the edge of the tube mouth of the test tube 660, in one embodiment, the lower pressing die 621 is provided with a plurality of punching tools, each of which is arranged around the hot pressing member. Specifically, the punching tools are arranged in a circular ring shape and are arranged around the outside of the hot pressing member. The punching tools are used to cut the outside of the sealing film to separate the sealing film from the film strip. When the hot pressing member moves toward the support tray 631, the punching tools approach the test tube 660 on the support tray 631 as the lower pressing die 621 moves downward. When the hot pressing member heat-seals the sealing film and the edge of the tube mouth of the test tube 660, the punching tools cut the outside of the sealing film, thereby separating the sealing film on the tube mouth of the test tube 660 from the film strip.

[0036] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A test tube sealing device for detecting pesticide residues in tea, characterized in that: include: Guiding mechanism, heat sealing film mechanism and supporting mechanism; The heat-sealing film mechanism includes a lower die and a lower-pressing drive assembly, wherein the lower-pressing drive assembly is connected to the lower die in a driving manner, the guide mechanism is used to convey the film strip to the bottom of the lower die, the lower die is provided with a hot pressing piece, and the lower-pressing drive assembly drives the lower die to move toward or away from the film strip; The supporting mechanism includes: a supporting tray, a limiting block, a limiting plate and a supporting drive assembly, wherein a placement hole is opened on the supporting tray, and the placement hole is arranged opposite to the limiting block, and the supporting drive assembly drives the supporting tray to align with the lower die; A buffer hole is provided on the limit plate, a limit rod is provided on the side of the limit block away from the placement hole, a spring is sleeved on the limit rod, and one end of the limit rod passes through the buffer hole, and the supporting drive assembly drives the limit plate to move toward or away from the placement hole.

2. A test tube film sealing device for detecting pesticide residues in tea according to claim 1, characterized in that: The supporting drive assembly includes: a driving rod, a second motor and two fixed seats, the two fixed seats are arranged opposite to each other, and the opposite inner sides of the two fixed seats are provided with a first sliding groove that extends outward and is lifted, the second motor drives the driving rod to roll in the first sliding groove, and a first connecting rod is provided on the side of the supporting tray facing the limit block, the second motor is slidably set on the first connecting rod, and the limit plate is connected to the second motor.

3. A test tube sealing device for detecting pesticide residues in tea according to claim 2, characterized in that: Second sliding grooves are provided on the opposite inner side surfaces of the two fixing seats, each of the second sliding grooves is arranged opposite to one of the first sliding grooves, and the supporting tray is slidably arranged between the two second sliding grooves.

4. A test tube film sealing device for detecting pesticide residues in tea according to claim 1, characterized in that: The guiding mechanism includes: a first motor, a feed roller and a receiving roller, the feed roller and the receiving roller are arranged opposite to each other, the axial direction of the feed roller and the axial direction of the receiving roller are parallel to each other, the first motor is driven and connected to the receiving roller, and the feed roller and the receiving roller are used for winding film strips.

5. A test tube film sealing device for detecting pesticide residues in tea according to claim 4, characterized in that: The guiding mechanism further includes: a first guiding post and a second guiding post, wherein the first guiding post and the second guiding post are arranged on two sides of the lower die opposite to each other.

6. A test tube film sealing device for detecting pesticide residues in tea according to claim 1, characterized in that: A sleeve is provided in the placement hole, and at least a portion of the sleeve protrudes from a side of the supporting tray facing the limiting block.

7. A test tube film sealing device for detecting pesticide residues in tea according to claim 1, characterized in that: Two second connecting rods are provided on the surface of the supporting tray facing the limit block, and the two second connecting rods are arranged opposite to each other. A buffer plate is provided on the limit rod, and a limit hole is provided at both ends of the buffer plate. Each second connecting rod passes through one of the limit holes, and the limit rod is connected to the limit block through the buffer plate.

8. The test tube film sealing device for detecting pesticide residues in tea according to claim 1, characterized in that: The lower pressing die is provided with a plurality of punching tools, and each of the punching tools is arranged around the hot pressing part.

9. A test tube film sealing device for detecting pesticide residues in tea according to claim 8, characterized in that: The shape of the hot pressing piece is annular.

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